Piston distributing-valve for compound steam-engines.



R, WOLF. PISTON DISTRIBUTING VALVE 30R COMPOUND STEAM ENGINES. APPLICATION FILED JULY 23, 1913.

1,095,057, Patented Apr.28,1914.

I I p H m If +50: pm 7 3 2 I 1 {i I W COLUMBIA Pl-AHOGRAPH co wAsnm RUDOLF WOLF, OF MAGDEBURG-BUCKAU, GERMANY.

PISTON DISTRIBUTING-VALVE FOR COMPOUND STEAM-ENGINES.

Specification of Letters Patent.

Patented Apr. 28, 1914:.

Application filed J'uly 23, 1913. Serial No. 780,709.

To all whom if; may concern:

Be it known that I, Runonr WoLr, a citizen of the German Empire, and resident of lvlagdeburg-Buckau, in the German Empire, have invented certain new and useful Improvements in Piston Distributing- Valves for Compound Steam-Engines, of which the following is a specification.

This invention relates to a piston distributing valve for compound steam engines of the kind in which the piston valve common to the two cylinders of different size has channel shaped passages through it for distributing the exhaust of steam from the smaller cylinder (high pressure cylinder) and the admission of steam in the larger cylinder (low pressure cylinder).

The accompanying drawing is a longitudinal section through a distributing valve constructed according to and embodying this invention.

The invention consists in substituting for the usual channel shaped passage through the piston for the admission to the larger or low pressure cylinder N, an annular recess m in the circumferential surface of the piston valve 79 which recess remains in communication with the smaller or high pressure cylinder H and permits of direct passage of the steam from the high pressure cylinder to the low pressure cylinder, when the valve 79 in moving from its middle position has traveled through the distance a which corresponds exactly with the lap a for the remaining openings of the valve.

The distribution is as follows :-After the valve 7) has moved from its middle position through the distance 6, supply of steam from the high pressure cylinder H into the receiver R begins, (see arrow 1), whereas the supply or admission of steam into the low pressure cylinder N begins through the ports 0 and 0 (see arrows 2 and 3) after the valve p has moved from its middle position through the distance (L The advantage consists in a diminution of the distance 00 between the steam outlet port [L of the,high pressure cylinder H and the steam inlet port 0 to the low pressure cylinder N, and in a reduction of the number of places to be kept steam-tight; also in a reduction of losses of sure cylinder, is

pressure and heat during the supply of steam from the high pressure cylinder to the low pressure cylinder, since the half or a great part of the working steam evading the receiver is passing from the high pressure cylinder H directly into the low pressure cylinder N. Hereby it is attained that the engine possesses, in respect of the steam supply by the shortest way the advantages of the known lVoolf engine, while the disadvantage of the Voolf engine, namely interdependence of the steam distributions in the high pressure cylinder and in the low presavoided effectually in that, owing to the choice of varying laps, the steam passing through the receiver is warranted an independent exhaust from the high pressure cylinder and an independent admission into the low pressure cylinder.

The valve may also be used for controlling an outlet or exhaust or an auxiliary outlet or exhaust at the low pressure cylinder by putting the chamber K into communication with the condenser or the eX- haust pipe (see arrow 4). The exhaust from the high pressure cylinder may be effected by opening a single outlet, or if several channel-like passages in the piston valve are provided, by opening several outlets.

I claim:

In combination, a high pressure cylinder, a low pressure cylinder, a steam-receiving space being arranged between said cylinders and both cylinders being provided with ports leading from the cylinders to said space, a reciprocating piston valve working in said space and provided with ports adapted to cooperate with the aforesaid ports to admit steam into and out of said steam-receiving space, said piston valve being provided with separate circumferential ports adapted to directly connect the ports of the high pressure cylinder with the ports of the low pressure cylinder to thereby conduct a part of the steam from the high pressure cylinder to the low pressure cylinder with out entering the said steam space.

RUDOLF l/VOLF. "Witnesses:

Or'ro VON SzozYMUcK, ADoLF SoHRonnR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

